Now understand that the camera is sitting on top of at least three and a half to four feet of Aluminium (or Carbon fiber - which I believe would be more flexible so even worse...). So as the first slap of the mirror pushes vibrations down the tripod, there is movement and that would cause shake...

FWIW, one advantage of carbon fiber is that it actually damps vibrations better than aluminum. Wood is even better than CF, but no one wants to lug around a set of heavy wooden legs...

Now understand that the camera is sitting on top of at least three and a half to four feet of Aluminium (or Carbon fiber - which I believe would be more flexible so even worse...). So as the first slap of the mirror pushes vibrations down the tripod, there is movement and that would cause shake...

FWIW, one advantage of carbon fiber is that it actually damps vibrations better than aluminum. Wood is even better than CF, but no one wants to lug around a set of heavy wooden legs...

I beg to differ, apparently some people do or this would be for sale. Heh, cheaper than some pro legs even, and only 6.2 pounds!